linux-kernel - [PATCH] ext2: ensure link targets are NULL-terminated

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Date:	Thu, 11 Dec 2008 19:16:28 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, Boaz Harrosh <bharrosh@...asas.com>,
	Duane Griffin <duaneg@...da.com>, linux-ext4@...r.kernel.org
Subject: [PATCH] ext2: ensure link targets are NULL-terminated

Ensure link targets are NULL-terminated, even if corrupted on-disk.

Signed-off-by: Duane Griffin <duaneg@...da.com>
---
 fs/ext2/symlink.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/ext2/symlink.c b/fs/ext2/symlink.c
index 4e2426e..9b164ba 100644
--- a/fs/ext2/symlink.c
+++ b/fs/ext2/symlink.c
@@ -24,7 +24,9 @@
 static void *ext2_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
 	struct ext2_inode_info *ei = EXT2_I(dentry->d_inode);
-	nd_set_link(nd, (char *)ei->i_data);
+	char *link = (char *) ei->i_data;
+	link[sizeof(ei->i_data) - 1] = '\0';
+	nd_set_link(nd, link);
 	return NULL;
 }
 
-- 
1.6.0.4

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